1999/08/19 by Massimo Giovannini
Physics and Astronomy · #Amplitude #Cold Atom Physics and Bose-Einstein Condensates #Context (archaeology) #Cosmic microwave background #Cosmology and Gravitation Theories #Coupling (piping) #Coupling constant #Dilaton #Faraday effect #Magnetic field #Photon #Physics #Quantum Electrodynamics and Casimir Effect #Quantum electrodynamics #Quantum mechanics #String (physics) #gr-qc
paper · pdf · doi:10.1103/physrevd.61.087306
published as Phys.Rev. D61 (2000) 087306 · 9 pages in LaTex style
arxiv created 1999/08/19 · openalex publication_date 2000/03/28 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We discuss the production of multiphoton squeezed states induced by the time variation of the (Abelian) gauge coupling constant in a string cosmological context. Within a fully quantum mechanical approach we solve the time evolution of the mean number of produced photons in terms of the squeezing parameters and in terms of the gauge coupling. We compute the first (amplitude interference) and second order (intensity interference) correlation functions of the magnetic part of the photon background. The photons produced thanks to the variation of the dilaton coupling are strongly bunched for the realistic case where the growth of the dilaton coupling is required to explain the presence of large scale magnetic fields and possibly of a Faraday rotation of cosmic microwave background.